Got a pretty big problem: around the start of Tower Keep, maybe because I got the Shield, the music stopped playing and the game started lagging really badly, even on my gaming laptop. Apart from that, my main feedback is that the playing area should be smaller or the game window should be bigger. Having extra space at the edges makes it way easier to shoot below yourself, especially when you're in a panic. Also, more frequent checkpoints please. Between those problems, I gave up on that one room with the spikes.