Holy crap! This little game has a lot to offer for those of us that love challenging skill-based games. This game will leave you trying to shave off seconds. Seriously addictive!

Speed run the water levels from Mario against other sweats around the world

Fantastic

Don't drown reminds me of more accessible Mario Wonder's "Final Final Test Badge Marathon." All the levels are bite-sized with a good leaderboard system to compare your times and scores globally or with your friends. You don't have all the badges but you have enough speed variation(sprint/regular/with chest/sprint with chest) that you're more than enough occupied with those variations and always trying to move more quickly. You're also trying to find creative ways to get the environment to deliver your chests for you, to cut seconds off your time.

The sprint mode is so fast it's hard to react, so at some level you're replaying patterns of previous runs that worked. You'll often find yourself taking advantage of moving through enemies when you're damaged, until you eventually run into enemies you can't move through when stunned. It's a good adaptation, keeping people from skipping some of the technical parts.

The hit boxes and responsiveness are great. You never feel like the game cheated you into getting hit. By default the death sound effects(if there are any) are muted and you're back on your way to solve the puzzle again. It's like "I messed up and that's ok."

Inevitably you'll fail hard. Thankfully there's no annoying animation or sound when it happens outside of a short death animation that can be skipped. Going from a failed run to restarting the level takes less than a second. The leaderboards provide constant tension between finishing the level and finishing the level quickly. Additionally, if you're going too slow, you'll run out of oxygen. I spent multiple hours trying to speed run certain sections and I'm really hoping for a no hands achievement, as I'm fairly certain one of the earlier levels could be completed without actually grabbing the chest.

The level design is great. You do a massively clean section and realize that's how it's meant to be done and then hit your head on a stationary object you've never even noticed before. The eels were a bit tedious, but once you get past that set of levels, the game gets more open and the epic music starts to come online.

It's a good time, worth more than the money you paid for it and incredibly well polished. Add some scores to the leaderboard; I want to see how I compare.