Thank you for your feedback and for playing the game!
The 2 block jump can be completed by quickly double-tapping the jump button, which let's you jump higher. This is mentioned in the tutorial, but I will add another mention on this mechanic near the place of this junp.
Glass doors are designed as literal skill checks, as this timed attack is a very important mechanic to learn to experience the game's combat to it's fullest.
Middle mouse attacks are a bit slower than other two, but seems like I will still have to play around with balance, so thank you for taking your time to provide your observations and thoughts!