nice submission!
Should defiantly put a tiny text tutorial because its not clear enough what needs to be done.
i like the idea of shooting enemies to activate platforms, thats a nice take to the "invisible" theme :)
I saw you wrote its your 2nd game developed for a Jam, keep up the good work and try to time what you have to do in order to release, dont forget about tutorials and gameplay.
keep up the good work :)