Really liked the presentation of the game! The beam weapon was nice, usually people go for simple projectiles, so it was fun to see something different!
For feedback, two points - both of which I raise being aware of the time limit! First off, it would be great to have some sort of a hit indicator for the enemies (e.g. they flash white when hit). Currently they have so much health, that I was uncertain if I was hurting them or not. Secondly, the relic being reduced to 0% health doesn't end the game. I "beat" level 2, but for the majority of the level the relic had no health, but I could keep killing monsters to win the game.
Edit: Also just read that you did the art yourself, for which I have to say the the Mech design is great (I'm a total sucker for Mechs)