Continuing from last time I played this...
-My notes seem to indicate I thought the Cavern was only sort-of functional but that I liked the weapon I had there
-The computer fight was rather amusing
-Around that point, the enemies start getting very repetitive, although I like the whole pseudo-arcade style you're trying to purvey
-Liked the white area
-The Bowser-axes are an interesting weapon, and the cube gun-style one is nice too
-Once you get the G-Gun upgrade, there's really no reason to switch back to the old version, despite the option for it. Also, firing the new version upwards makes the entire bullet spritesheet appear
-The Redgo bots have a ton of health for a regular enemy. I ended up running past most of them because they take so long to kill.
-The Flamer is awesome, I've always wanted a strong weapon in the style of the Lv2 Bubbler
-The area where you partner up with your buddy might be my favourite so far, but the section after that (moving down in the house) is waaaaay too long and slow. I like the skeletons though.