Cool game!

In terms of comments, I felt that both the player sprite and the obstacles were quite big for the size of the game screen - I think the game would be more interesting if you reduce these in size.

Mechanics were grand - maybe you could add power ups to switch up the gameplay?

In terms of replayabilty, there wasn't a huge amount of variety, so I think it would be hard to replay the game.

Great effort though - hopefully some of the above notes are useful!