The first level was very well played. No mistakes here.

The boss after the first level was good as well.

The second level is an autoscroller, so it's always the same time.

Third level was played good, the bosses did not throw bombs out of range.

Fourth level was good, no mistakes there.

Fifth level was very good, the boss after that level was very good as well.

Level 6 was quite slow sadly.
When I went to the right side, I wanted to play safely by getting the
third hit by the cactus that is defending one of the totem parts.
On the left side of the level I failed to get on the first cloud, luckily the cloud right after that was going in the same direction.

Level 7 was ok, the opponents punches / blocks seem to be RNG based.

Level 8 wasn't too bad. The level completion time is mainly based on the platforms at 28:43 and 29:31. You can get on the first platform one cycle earlier when you played the level before that well. You can get on the second platform one cycle earlier too but only if you got on the first platform early.

Level 9 (Mine Cart) was good, I often died in this level at least once but not this time luckily. Minor mistake at 33:57 where I hit the obstacle on the rails and lose about 1 second.

Level 10: First two challenges were good, in the boxing challenge the enemy blocked the final punch for about 15 seconds (again).

Level 11: This level is mostly like an autoscroller. But the faster you beat the enemies  on screen, the earlier the game will scroll to the next enemies.

Final Boss: The first four hits were fast, the last one unfortunately took some time. There's nothing you can really do about the speed of the hits though since the boss seems to be RNG based.