I got to a big room with a door that wouldn't open. If that was supposed to be the boss area, then I think it would've been better to have text appear along the lines of "end of prototype" so it wouldn't appear as a soft lock. Other than that, I think the default weapon (the long range one) shoots too slowly, and the jump loses momentum too quickly after letting go of the button. I also managed to get through all the rooms I found without fighting at all, but I don't know if that's bad or good.
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Thanks for your input! The big room was supposed to be where the boss fight happens, unfortunately we couldn't implement it on time, so it ended up empty as you found, sorry. We were in a real rush to submit it on time, so we'll keep in mind what you said about the gameplay in case we manage to release another demo, thanks!