Great game! Sound design and UI were outstanding and the controls are smooth and respond really well. It all felt very impressive and professional.
Although I think the color coded shields are a pretty interesting mechanic, it ended up no working so much for me AT FIRST, because I couldnt remember quickly which mouse button activated the green shield and which activated the blue one, but I could beat the game without them since movement is so good in this game.
I then was able to beat the game using the shields and I didnt realize that I was building up this super blast thing and it was SO cool that that blast happened to be the one that killed the boss! I think a short tutorial explaining all of those little mechanics would make the whole experience even more enjoyable. Amazing entry!