Initial import

At least made something displayed on the screen and controllable with keyboard. This forgotten feeling from old times when I did Basic programs on ZX Spectrum. Because in all other attempts of making games I fell for architecture or obscure technologies, so no visible results at all. And now I'm going on the easy path: Tic-80 has everything built in, including sprite editor and music tracker. It even has built-in lisp, lol. Hope I'll manage to make boulders drop at least.

Had to rollback to Tic-80 stable, because couldn't build master version with html export support. Sadly, it has older fennel with broken `match`.