Very well done! Super simple but engaging. There's a red line, there's one button, you figure it out fast. The way the fill speed changes was very cool, and it kept the game from becoming too repetitive too fast. Every now and then I'd think, "OK, I have the hang of this." Then it would drop a quick fill on me that was almost a jump scare! The SFX were very nice as well, super clear and changed with the water appropriately.
I wish that the "Enter Player Name" for the high score thing came either before or after you played the game though, because I totally missed it.
Great work!