Does the game just end in the second room? I encountered an invisible wall or something and couldn't progress further...
Abrupt endings aside uh yeah nice little tech demo! The art was def the highlight because everything looked and sounded pretty great and definitely Gameboy appropriate. Tho I wiSH the player character mech-guy had some kind of jumping animation. Gotta have a jumping sprite, dude!!! I feel nothing without one!
You're probably definitely already aware of this, but enemy variety is a must; just being able to hold right and nobrain destroy everything is a no-go to satisfying gameplay. The fundamentals of moving and shooting felt pretty decent though. Polish it up with that full version and you're good!