I think getting two at once might be a bit too overload.
Eh, I dunno, I think it's clever to have it serve double duty, I just hadn't used either ability in awhile so I momentarily forgot about the jumping portion of it.
That boss was... tough. I definitely didn't find the secret weapon so I fought him with lasers. Overall it's a fun fight, a lot of variety of skills to dodge / learn the patterns of. I think it's hurt somewhat by the fact that I was using a keyboard instead of a controller, but I would say that about any platformer type game really.
I think the dark room version of the boss needs a bit more visual clarity that you're actually moving forward since I was unsure if the boss was lying about that or not (there is some indication when you move backwards to avoid the AAAAAAA attack, but that's only if you're paying attention).
I very much enjoyed the funky main theme remix during the end credits. Kudos on the music!