Walkthrough or Guide on how to beat the game and kill Hitler (at least once)
You wanna pick the The Rogue. Imo he is the best character in the game because he comes equipped with the best weapon: Sword and the arguably best secondary ability: Dash
The Sword is the best weapon because Attack Speed is the strongest element in the game and this is the fastest starter weapon. Eventhough its melee and some enemies are flying, it is still the best weapon, because those flying enemies always have an attack or movement in meleerange.
Shadow Step (or just dash) is the best or 2nd best ability because you can dash out of danger, generally have more speed around the maps and you can traverse vertical passages easily by dashing while climbing the ladder, to kind of glitchy dash upwards.
The most important item you want to look out for is the Lifeblood Potion (dark red bell, or old telephone looking thing) which will basically give you health regeneration up to full health. (When you start out the game your health regen is up to about half health I would say) Secondary you want to look out for the Brown Potion, giving you more strength aka damage output.
Level 1: Proceed through the levels mostly holding right and holding left click to kill everything. Dash when you are low on health or wanting to get out of a large group of enemies if your health regen isn't high yet. Collect the potions mentioned (you can collect the other potions aswell but they will not have any effect on this character[I also don't fully understand every potion]) Don't collect any other weapons, as the Sword is the best. There is one alternative secondary ability which is a gold heart, which you can use to instantly heal yourself. This one can be taken if you feel like you need the extra lifesaver.
First Boss (The Zeppelin): Climb the 3 different structures and destroy the satellite towers, prompting a cutscene where the Zeppelin is slowly descending. Stand under or in the Zeppelin and keep holding attack. You don't have to dodge the attack or bombs from the Zeppelin that much, because your health regen is mostly stronger than the attack (only exception is when he shoots the bomb in a tight cluster, which can potentially burst you down). In a lot of runs, the Zeppelin always went to the bottom left corner, where you can easily hold Attack and defeat it. Afterwards it will crash down with another lifebar. Simply walk into or up to it and hold attack again.
Collect (all) the potions especially the 2 mentioned and proceed to the next level.
Level 2: Basically just hold right and left click, dashing when needed. After some levels in the next section you will get to the bigger bird (The Sentinel) in the sky. This boss is optional, as you could simply walk to the far right and go to the next level.
Second Boss (The Sentinel): If you want to kill it however, wait for his laserbeam attack and dash in the opposite direction of which the bird is flying. After some flying he will come down and attack you. Hold down attack to damage it. Your health regen at this point should always quickly bring you back to full life. Repeat that process until the 2nd phase in which the bird will spawn smaller birds and shoot little lasershots instead of a beam. Kill the smaller birds when you have the chance and dash out of potential lethal damage. The big bird will fly down and attack you after you killed some of his birds. Repeat until he is dead. (Note: I guess the medal is bugged, since I have killed it numerous times but I never got the medal)
Collect the potions again and proceed.
Level 3: Same as before, simply walk through the levels killing all enemies and dashing when needed.
Third and final Boss (Hitler): Walk to the bottom right corner where you will find him. At this point your damage output will be enough to hit him a few times before he will teleport away prompting a cutscene. He will teleport to the top left and spawn a lot of enemies. Go up there and kill them all, dashing out to safety when you health gets low to regen it quickly back. When every nonHitler is dead, attack him a few times again until he teleports to the top right. Repeat as before until he teleports bottom left. Another horde of enemies, always look out for your health and dash when getting low. He then teleports to bottom right with another horde of enemies. Afterwards you attack him until his second phase in which he becomes big and has a strong melee attack that can potentially oneshot you. Dash through him and only attack him from behind. Do this until he dies.
You did it. You killed Hitler. Hopefully this guide helps. 5 Stars so people who sort by score can see the guide better.
My real score would be about 3.5/5 because it has some buggy mechanics and movement. Sometimes enemies will spawn already being damaged. The first boss is actually the hardest and the potions are really strange since I'm still not sure what all of them exactly do. The medals for killing the Sentinel and killing Hitler (as Rogue) don't work, at least for me. The shooting mechanic is in my opinion just really bad and inferior to melee. I would suggest instead of aiming with the mouse, binding the shooting in all 4 directions to the arrow keys or something alike. it would also make the game feel better if you could fight as a melee without the mouse. Even though there is an option to go back to the previous levels as seen with the E hovering over it, I never managed to go back once.
Other than that I actually enjoyed playing and theory crafting this game =)