Superb hyperdangerous indie platformer. Played through this one in one trance-induced sitting while stuck in a hotel. You have just one action button, which flips gravity upside-down as long as you're standing on the ground or ceiling. Impressive amount of variety given that simple concept. You die a lot in this game, but you just come right back so it is not punishing. Has some really good secrets for experts, including some that took me an hour of trying to execute, but isn't too hard to just play through normally. I wish it were longer.

Great indie physics game with inventive gameplay, great graphics and music, and some good twists. Played it all the way through the day I got it (it's pretty short) and loved every minute.

I played this game for almost 400 hours, so obviously it's one of my favorites. The best team-based shooter; only Threewave CTF and Counter-Strike can even come close. Only online play, so you'd better be ready to get killed by a lot of experts like me as you learn. The chief innovation (now about 15 years old) is that there are 9 different classes of characters you can play, each with their own advantages and play styles and foils. Lots of advantages to pairing up with other classes on your team, so this is one of the few games where team play really happens on public servers. Class balance and map design is excellent. 350 achievements (I only have about 80% of them even after 400 hours!), an unbelievable amount of community and new official content for free, and strangely since the "characters" don't even have names, a pretty detailed universe with comic books and videos and stuff like that. The maintainers obviously love this game.