Some feedback :)
The game is simple and nice which is good. The UI could be improved a little. For example, maybe at the start, add text to prompt the user to left click to get the game started. As just looking at the screen wasn't much help at the start in knowing what to do. Also the restart button on game over could be improved a little. It's not standing out as its meant too.
If possible, I would search for some free music assets to add to the game. Background music combined with sound effects can have a big impact user experience.
I do also like the speed option. A nice touch.
If you would like to get in touch and discuss more about game dev or need any help in future. You can get in touch through my discord: https://discord.gg/aCYUedK7gS
Keep up the good work :)