Great game! Very nice art and animations, well implemented mechanics, everything feels great. I love the ingame tutorial. I like the boss mechanics and the warning before the lasers. Andit's cool that the boss gets harder by making the arena smaller every phase, but I think in the last phase the lasers are a bit too hard to dodge. And maybe it would be nice if the boss needed a bit less hits every phase, so it doesn't take so long.
I really enjoyed it, well done!