it's not a hard game.well, it's pretty hard but that's not the point.
the point is that "hard" games + cheap checkpoints = FRUSTRATION.
(and uh, the levels with the pink matrix thing are kinda strange, i don't know how the hitboxes worked but i happened to die many time even being quite far from the mess.)
let's get back to the point.
i forgot levels numbers but i had to quit at the level with turrets and gun. And you know why ? it's not because this level was hard ('cause i like challenges) it's because i had to go back to the previous level each and everytime i've been touched. And the problem is the previous level was almost harder than that one. i could win like once for 10 tries. That mean that everytime i loose at the turret level, i've got to play more than 10 time the previous one to get a chance to beat the next one.
That's a shame, your game is currently rated 2.1. It should have deserved top 5 daily features but the lack of checkpoints ruined everything and when people see this 2.1 rate, they are not likely to give your game a try. That's sad 'cause it's a really great game...

please watch this video on difficulty in games:

https://www.youtube.com/watch?v=ea6UuRTjkKs

I think it will help to explain why people are generally dissatisfied with the design choices you have made here.

this game was so frusterating >:(

This game really needs checkpoints. You should add music. It is a simple and fun game.

are u serious! i mean, it has nothing to do with it being your first game or not. Checkpoints for this kind of game is a matter of commonsense for god's sake!