Thank your feedback yccore and also for your compliment. I'll add the W for the jump button as you proposed and I'll try to recreate the bug that you experienced and fix it (this will be added in future updates in my other itch.io account). More importantly, I don't have the time now for finishing this game because I have my studies, but I'll add this game in my to-do list after I finished the other game I'm currently working on.
P.S
This is just a hobby project and a coding practice , and not for commercial release, please don't look forward in the future too hard because it puts me in a lot of pressure.