this is the best modern take on Robotron out there. super comfortable to play without a mouse because of the 8-way shooting. cross-shaped lens flare with the additive blending is so pretty, oh my god. the sound design is so good too -- sounds like a Williams game but punchier and throatier.
(P.S. if this is gamemaker, if you want to export a mac version i may be able to help.)
edit: it gets so hectic past level 20, i love it so much