I am really astounded by the fact that you're a beginner. I loved graphics. The art style, the background were great. The main menu was amazing even though it didn't have to be! The music was really fun too!
In the beginning the controls felt too snappy but I got used to them.
I didn't like level 8. It wasn't about skill as much as it was about memorization - or let's be honest; luck. Having to guess where you have to jump is not really good level design. Similarly, there were levels where I had no idea where to jump (e.g. level 3 after the bubble roundabout). As for the levels I really enjoyed, level 7 and 10 were on top, though I preferred level 7. The moving bubble was really fun though I understand if someone could say the opposite. In level 7 I especially liked the final jumps over the electric fences. They were stressful but you knew what to do and how to do it. Level 10 was slightly worse because of how long the final sequence took me. The 3, 2 1, now countdown was really slow and it felt more like 3, 2, 1, 0, -1, -2, now. This lead to the death of me many times in a row.
I really love this entry. Great job and good luck on your future games!