It's actually closer to 12 hours but I really enjoyed Guacamelee. Those last two achievements are for doing a Hard run, which I'll do later after a little break from the game. It was more a beat 'em up than a Metroid game but there were still some neat platforming puzzles and the combat was still fun. They were pretty shameless in aping some Metroid staples (Choozo was especially lazy) and while doing some Shinesparking-esque manoeuvres I wished they went even further. The game is still very unique even if on the surface it looks like it's straight copying other games and memes.
It's a shame that this seems to be forgotten due it coming out at the same time as Spelunky and Paper Please. While I don't think I would ever attempt it, I would be interested in seeing a speedrun of it at something like AGDQ. The progression was very linear but it felt like at moments there were places where you do some unintended sequence breaks.