i like the game like this, but i have 2 big tips for you:

1) turns gameplay into landscape

2) increase the distance between the boulders

looks pretty alright as a prototype, think you should expand it, would look cool

I think it would be worth expanding. From what I can see the idea is an upgrades and distance type game. However, I also honestly think it is pretty hard to judge at this stage there isn't a great deal redeeming here. The movement is smooth, but the rafting is repetitive and there isn't any measure of success. It looks like it may be procedurally generated and random? Which is fine for just go as far as you can, but it also makes success rather random as untenable situations can pop up. Hit detection for crashing also seems to be a bit off, I know there were times when I crossed portions of rocks, and it seemed like sometimes I crashed without actually contacting (though because it instantly jumps you that can be tough to measure). The sound is literally nothing but white noise. No crashing, no splashing. The initial graphics are pretty decent but the rafting just looks like a log. Where is the player on the raft? IMHO it probably should have been expanded some before this submission. That all being said I think it is worth expanding/fixing, Do you?