This game is a pew-pewer's dream. I love not having to be moving in the direction I am shooting. The sound when an enemy gets destroyed is satisfying enough to reduce anyone's stress. The music is very fitting with the spooky environment and enemies. The sound when dying is just right, loud enough to be punishment for losing but not discouraging or scary. I liked being able to choose any level to play from the start in case I can't finish a previous level.
The game did really well in teaching how to play in Level 1 and introducing new towers in Levels 1-6. These levels fit really well with the tower that gets introduced in them. I didn't find Cross Towers useful outside of Level 5 though. Being forced to restart Level 4 due to not using a Buff and Normal Tower in order to get the one green enemy that was impossible to reach was annoying but did make me think tactically, though I at first thought that it was a bug. I wish the game explained that health regenerates over time because at several points I got confused and thought it generated when picking up coins or at the end of a wave.
The hardest level and wave by far for me was Level 6, Wave 3 where I only have 295 coins, allowing for a single Explosive Tower or an AOE Tower and a Buff/Slow Tower to prepare for the onslaught of bats and bears in a level with no loops (just dead ends). It was hard to keep up with the assault with only being able to get cornered 3 times. In the end, I think I had to get lucky with being able to quickly dodge around oncoming bears and bats when I got cornered.
I liked the variety of enemies which have different durability, speeds, and methods of attack which the player quickly attributes a different danger level to when playing the game. The green enemies are one hit KOs and extremely slow and are the lowest threat. Bears, bats, and skeletons take more hits to kill, are faster, and move intelligently. Ghosts can go through walls. Flames can damage you just by getting close. When killing a ghost that is in a wall, its coin sometimes appears on the wall, causing the character to not be able to grab it, which might be annoying.
I loved the variety of towers and the introduction of them as I stated previously, but I did find that they can make later waves incredibly easy especially in Levels 6-9 when the Explosive Tower was available. The Buff Tower might be a little overpowered. On the other hand, I enjoyed feeling accomplished when I constructed a tower setup that can take any wave even if I don't shoot any enemies.
I did not like the final boss in Level 10 due to not being able to use towers or coins, which is a main premise of the rest of the game. I didn't understand why there were 2 waves in that level and what caused to wave to switch from 1 to 2. The boss took many hits to destroy and I wish it had a health bar or counter to show how close to death it was since I got a little impatient.
This game could be interesting to speedrun due to being able to release as many waves as desired without waiting for previous waves to get destroyed. Speedrunners would need to find sweet spots where they can release as many waves as possible while not risking death and being able to collect coins and build towers while more enemies come onto the level (not leaving collecting coins to the end of each wave like a player would in a longplay or a blind run).
There were several places where the game suddenly froze and I had to refresh the page. After finishing Wave 10 in Level 7, there is supposed to be a Wave 11 but the game freezes upon pressing [Enter]. The game also freezes after killing the last enemy in Wave 10 in Level 8 and killing the final boss bear in Level 10. Other than that, I found none.