the games themselves have perfectly functional physics and the graphics are nice and clean, very easy on the eyes. though the resolution is a bit weird but i could just zoom out, it's made to emulate the tall screens of the machines that played these types of games (weird memorys of me being stuck at the pup because my dad yay)
the only real issue is the lack of background music, you just hear the same pop sounds, that's all and it gets grating after a while, like i didn't wait to see if difficulty ramps up after a while, there's certainly no level states, just going on forever.
still though this is a faithful recreation of many puzzle games, an amazing tech demo just can't really give it any creativity points, though using the engine for an entirely new game could be quite a fun endevour if you're still making games at this point.