Ok, don't get me wrong because I really like this kind of arcade stuff here.
It's a great effort and the level design is really good.

But it needs still a lot of work with design overall. First, the controls get jammed from time to time and that's clearly a no go. Then you should have a sound when the player (or enimies) get hit, which would increase feedback and thus playability a great deal. Think about switching y-z for different key layouts.

The music is the best part in my opion. Still it should be around 10x times longer before repeat.

It's great, keep up the good work!

Nice idea, love the music... but... it lacks something... Seen many similar games, this one doesn't add much new to gameplay itself save the lab... Speaking of which the H2 which we collect, should be used when making the upgrades in the lab (i guess), well it isn't, also the upgrade times... 30 seconds for first level is too low for me not to wait for it to complete yet too long if i am to wait for all 1st levels to complete (which i would love having issues beating even the first level), some balancing would be great, perhaps make it like 45 or 60 seconds with 30 second increments. Also make the upgrades a bit more worthy?

ditch it