Beginning with praise:
-Random layouts are hard, so good job doing that.
-The movement isn't too slow, and feels alright to control.
-The enemies target you properly, so good job there.
-With the collectable gems, it certainly fits the theme.
Aaand the things to fix/improve:
-When you restart from death the music starts, but the music from the last round doesn't stop playing. So it just loops on top of each other.
-The enemies are a bit too much, some rooms had like 5-6 enemies and you'd usually take damage before you got a chance to react.
-The randomized rooms managed to put me on top of a raised block when I moved from one room to the next. So I couldn't move, and got stuck there.