This was pretty cool. The background was somewhat blinding, since it was a bright saturated blue, but other than that, I thought the visuals were pretty charming. Bright, saturated background colors have a tendency to cause visual fatigue, and when you factor in the playtime of the player, it's more likely than not that it'll have an effect. The hitboxes for the chest and bubbles could've also been closer to their sprites. The game could've used a level progress indicator to motivate the player. Overall, it was a satisfying game to beat, despite the difficulty. I played it in a call with my friend, and I'm pretty sure he enjoyed watching me suffer... lol.