Ok I played the html version cause the exe wasn't working on my end!
I really liked it! The running was really nice and relaxing and I loved the level design, not too challenging but not boringly easy at the same time. The procedural generation that happens around the 700s-800s (score wise) is very messy and it looks like it tends towards impossible jumps, so I can't really go on forever, unfortunately. But I'd love to see some more hand-designed levels since you seem good at it! If you're committed to doing an infinite runner, though, I'd recommend looking into the type of procedural generation something like Splekuny does, even if you do it on an easier level. The tl;dr is hand-design different sections and have them randomly appear, and then if you want to go further to prevent repetitiveness, you can make minor modifications to those sections using a randomizing code. Super interesting stuff!
Keep up the good work and congratz for putting this out =)