A very mediocre game.
It reminds me of quite a few games, most of which have a bit more variety than this. Doodle Jump, for instance, has power ups which greatly increases the fun of the game.
The art could be better. The art style is fine, albeit a tad boring. But the "enemies" are just floating hexagons. I initially didn't think they were enemies but instead a type of collectible coin, as these type of games often have.
The thing that annoyed me the most is that after every time I lost it went back to the pre-loader. It really breaks the flow of the game. It may not seem like much but in a game where you're losing quite frequently having to click twice (first the play button, then the retry button) quickly becomes very annoying to do.
The leaderboard seems to be glitched as well. It lists my highscore as 15,242, when the highest I got was around 1,200~, right after the floating hexagons turned purple. Considering that, the leaderboard is basically pointless. I'm assuming that it *usually* reports the correct score, but occasionally it's completely wrong.
In its current form it leaves a lot to be desired. It's buggy and quite boring. It's a fairly simple game concept with not much to it to make it interesting or enjoyable to play. If what I listed were added/fixed then it'd make it slightly better, but honestly not all that much. I think it'd need a complete overhaul for it to warrant anything above a 3.5/5. Maybe with more context about the game (e.g. you're new to programming and it's a programming project) I'd be willing to give it a higher score but without it my score is 2.5/5. It's quite mediocre.