Thank you very much for the feedbacks! We tried to work in some of the things you pointed out but the time was running out and we decide to do whatever it takes to go out with at least a game that works in the basics.
We tried to spawn the player around the jars but, in the few tests we make, we found it confusing as well because testers (family members LOL) dosen't understand the light up mechanic if they spawn away from the lamplights. Maybe a little map or an interface element pointing to the jars can fix this problem.
The meter is a very good idea that we did'nt think of!
We'll consider it, thanks again!