Yeah, never got around to swapping the controls around, they're definitely wonky. At the very least you can redefine your own controls. I think the rom version might be slightly more buggy than the disk version for some reason. You should have better luck killing enemies with that release (though most of them have 3-4 hp). Thanks for playing!
Yeah, it definitely needs a bucket of polish. It's our first time working with the software and it has plenty of quirks. Doing a game in 2 weeks is pretty challenging and the coding side of things was mostly done in a few days right at the beginning since our programmer was busy for most of the second week. I'll give your game a proper review on its page, I've spent plenty of time with it since it was a very early submission.
Yes! Definitely limited in some ways and doesn't support all the machines I want yet but it is rather nice. Level and sprite making is integrated right into the software and there are some pre-generated scripts to get you started really quickly. The scripting language is relatively limited, but pretty easy to get started with. At the very least I prefer it so far to GBStudio for making simple arcade platform games. Metamorphosis and Pipes were both made at least in part by it this jam too (though all for different computer systems).