I agree with others -  a timer would greatly improve the experience. The game could last forever and I got bored after a 100 haha. But it's a nice concept, hope you continue the development!

Nice guessing game could go for ever since there is no timer.

It's simple, but kind of fun. A timer would make it probably even more fun!

Honestly if you add a time limit and add the option to choose "+" and "-" with the arrow key, this game will be in my top 10 for this jam. But for the moment, there is not really a challenge. Great job tho!

The gameplay was pretty simple, which did make it easy to understand but it did become bland after a while. There was also no real time limit for choosing the right one, which made it pretty easy. I sometimes also hovered over things accidentally so it might be nicer to either use clicks or keyboard input.
Overall a pretty simple but decent game, good job.