okay, this is a long shot, but the final boss has a really distinct hexagon attack that's basically the exact same as one in Copy Kitty. was that an inspiration or just convergent design? i've never seen it anywhere else, but the shape and timing are near identical. Copy Kitty added this boss only a few years beforehand too.
the boss starts using it at about 2:30 in the video.
this game's great btw, i found it through portmaster and it was fun to play a few levels before bed each night. ❤