Just other 2 levels and it's a staff pick!

It runs smoothly even at that resolution, has well balanced difficulty, nicely sharp detailed rendered graphics, quite appropriated music & sfx.
Maybe the music volume is a little pumped up(even if I like it :-)). It may get a little repetitive if you're going to use it in each level.
It's perfect for a demo, but since I'm a bit picky here are a few improvements I think could add something to the game.

Absorbing: I'd really recommend to put a small tutorial (or maybe some ingame tips) on how to use the "absorb" function of the ship - for the casual player it's a bit confusing how to use it. Also, make it more useful! i.e. particularly effective against a few enemies or situations.

The Boss: probably it was intentional, probably it's just me, but it took way too much time to beat it (about half the perceived playing time).

Bonuses: maybe one-three bonus types will be enough if you don't plan adding too many levels

Levels: it will really be a pity if you leave the game as it is right now... it has potential - you already know it! Other 2 levels and a final boss would be nice, and would not waste all the efforts you've already made so far!

Keep up, my congrats for such a great demo!