Thank you very much for playing Crystal Mission. Yeah, I 100% agree with the spikes! I wanted to re-implement them, but was working on the Boss for the last 8 hours of Jam, and unfortunately didn't go back to spikes.
Game saves some data in case people died, but I understand that people want to play as many games as possible so its hard to reach last Door which is the Boss fight.
I didn't have time for tutorial, but my game page explains has the instructions:
For better and easier experience I suggest using ( W A S D) Keys
Move - (W A S D)
Attack Swing ( J )
Attack Throw ( K )
Thank you for your Feedback!