Here's some improvements till today.
1. 'Controls: I wasn't a fan of the weight of it it felt a bit less responsive than I'd like'
-> I've removed the weight of jumping.
2. 'I really didn't like the timer'
-> There's no more timer.
3. 'Checkpoints: I felt there weren't enough.'
-> I've added enough checkpoints. (It was a very difficult work for me, tough.)
The updated version(0.8) is now available. Thank you for the review and I'll keep working on it.
Thank you for the review. Most of your critics are what I'm trying to fix. I'll be back to you as soon as possible with an enhanced version of the game.