my demake for a 48k ZX Spectrum, a very early work in progress
Better come back later, this is not a real game yet.
Anyway, here's an emulator, move the poor guy around with cursor keys or WASD, directional fire — IJKL (or M/space, if you really must).
Inspiration: Inding of Baasic
Sources on Github
Download isaac.sna image file