Not necessarily "alt games" but just cool, weird stuff you never thought you'd see. Many are free, all are worth your time.
Some are more experimental than others, I'll try and note whenever a game should be treated as such (very short, no ending, no point etc).
Short free Genesis game (run in Kega Fusion or similar), impressive 3D effect despite the hardware!
Disclaimer: made by an online aquaintance
Interesting procedural coastline generator, oddly amusing to just soom in and see the "detail"
Its and bits of weird games to sift through and play at your lesiure. All unfinished but at least weird enough to be interesting.
A pure exploration game with no dialog! May take you a half hour-hour to find most things. Adorable pixel art style. Could have used music a bit better but when the music kicks in it's good.
A chill audioscape to float around in as you enjoy the music.
A chill ambience machine where you make the ambient music. And it sounds pretty good even if you're really bad at composing music! A perfect game to relax in.
A cool VERY tiny beach walk 'em up with chill music and some fun text.
A gloomy hellscape of a low-res world. No objective (that I saw), fun to wander around in for 10-30 minutes. Impressive asset resuse from Grave Apologies, you can see the basic structures in the earlier Grave Appologies but it feels like a whole different game. Very interesting and ominous.
Stunning colors. Very, very small space to poke around in and nothing to "do", it's mostly worth a quick peek at it's aesthetic considering it's free.
Kinda makes me wish it were proc gen.
A slightly unnerving, very short text adventure-ish game where an old abandoned OS7 PC wants some totally not-creepy Sonic OC roleplay with you
A bit more interesting for it's idea than it's execution, Skeleton Flower has you undergo "desktop archeology" by viewing compressed (to 1 pixel) photos with (often broken) descriptions through a broken interface.
I find it a very interesting idea for a story telling method, but it's more experiment than anything. Still worth a few minutes if it sounds neat.
A rather meaty walking sim/exploration game about being a refugee in a surreal/exaggerated world that gets it's point across quite well after initially seeming a bit weird-to-be-weird.
About a half hour/hour long
It's like a combat-free dive into the Item World in Disgaea, endless randomly generated tile maps with a nice aesthetic to admire.