Thank you for giving it a go and leaving feedback, I'll try Hellslinger. I understand your confusion. I wish I'd had longer to make a better tutorial, I don't think the instructions are very good as they are.
I'll try to give some better instructions, hopefully someone will see this and have a better idea for what to do.
WASD to move.
Pressing e kills you and sends you back to the spawn point
You also die if you spend too long away from the spawn point.
When you die you drop a yellow turret which you can fire if you go back to it and stand on it whilst holding space and a direction.
Holding space will also make you stop moving.
Holding space down for a while will move the spawn point to your position.
The red turrets swap whether they are active or not every time you die.
The goal is to get to the grey horizontal bars, they're supposed to be stairs, but they look awful. Try and collect any stars you see.