MOST IMPORTANT POST FOR THIS GAME
I couldn't see a forum for this game anywhere or much strategy in the comments so here are my tips:
Get the passive loot boosting upgrades (money, loot chance, and quality of loot) asap as even slight increases in items make a big difference (more on this below).
Most of the offensive spells are weak and don't justify their mana cost, relative to the basic grenade. The fact the the maximum mana is only 300 makes this worse as none of the spells, apart from grenade and perhaps bezerk, can be cast more than once without waiting for mana .
Offense is the best defense. You need to clear the screen (and repetetive annoying 'wall' creatures) or you will die to collisions (which do huge damage), laser spam or to the creatures ramming your ship, so prioritise offensive items especially on the hero, since the ship is a terrible shot.
Flame is very good for hitting multiple enemies (especially as the number of them and amount of 'walls' increase with difficulty) but requires more skilled dodging. Laser and lightning are good for bosses as they allow you to concentrate on dodging and provide constant damage. N.B. the lightning gun can shoot up and backwards, though seemingly only at close range. This is very useful for one of my tricks: moving past shot spammers like the blue eyes and dragon heads and letting the lightning shoot backwards at them (whilst my ship helps) whilst I am safe :) you can move under or in front of enemies to dodge their shots whilst also being able to hit them.
Only 'craft' with then crystals and, since there's no time limit,make sure you get the legendary item (preferably a weapon). If you don't like the legendary refresh and try again.
It's not fair that you don't get all the prizes that preceded the level you reached. It means it's often better to not finish a challenge and keep playing all but the last stage. Also, when it says 18 chests are given as a prize you only get one. Why is this?
4.The Dragon Boss
His neck does not damage you so you can hide at the right edge of the screen :) Move there as soon as he gives the 'red fire' sign that he's about to use lasers. Don't get hit my his eye( which does big collision damage) when you move back out to continue shooting him afterwards though. Also, the lightning gun locks on and hits him (backwards) even when you're hiding there.
Storyline is guff but that's not what these games are for. The drawn out lightning blasts at start of boss fights are make me laugh because theyr'e so corny. How do I kill Death? Knock of each part? I've only tried once. I love his bulging sack by the way.
Overall: good game.