That was a very good demo. The aesthetic made me slightly nostalgic for the 8-bit platforms of my youth... 😁.
A few observations:
-The spiral staircases go on for too long. I understand it's to convey a sense that the towers are high up, but ultimately it punishes the player if they have to ascend/descend them multiple times. Maybe the first time you use one of the spiral staircases it's full length as normal and then subsequent passages are reduced in duration somehow.
- After getting the first key there is a long section where you have moving and crumbling platforms. Quite a few of them are almost blind, which results in a lot of needless deaths if you time it wrong. Not difficult to overcome, but it's not satisfying to die because the platform you're jumping to is on the wrong part of its cycle.
- I like the little bonus section at the end, but the boss has way too much health. It's not difficult to beat it, but it is very time consuming.
Anyway, overall, it definitely captures the retro-game spirit. Keep up the good work!