These games are all uninspired clones of each other and none of the ones I've seen has a difficulty curve. These art assets are okay and the puzzles, while un-fun and borderline impossible, are well designed if you're going for a rage game feel. Just make a new game!

The music is okay, it sounds too much like something made in fl studio however (change the synthesizer's settings or make your own with audio clip). Collision is quite bad, and hitting most solid objects mid jump give you a HUGE boost. I assume this is something to do with incrementing a value every time space is pressed and the player is touching an object (if that's the case just make sure it only does this when you're not already jumping). The enemies are simple (not a bad thing), too small, and suffer from the same collision problems as everything else in this game. The art is fine, but some things have a much higher resolution than others. Also, there's a sizable beginning portion in which the player has no inclination to use the attack.

You can just hold down left click and hover over things to shoot. It's like an infinite fire rate.