Feels really polished already as is !
Solid gameplay, and i like the minimalist style you've got going.
Game has a lot of juicy feedback for impacts and such, the music is really nica as well, for some reason it reminds me of something out of UT99 and that's awesome.
My only gripe is the "lock on" attack the generated bosses can sometimes have, where i found it hard to anticipate when they were going to fire and where, as they seem to still adjust their aim once the green box disappears.
Other than that it's real fun to play and i had a good time, well done :)