V0.25 Small update

• I dropped the "Energy Scanner I" on the floor and it's now a "Fragile Scanner I".
• Corrected some tooltip that incorrectly said "Energy needed for enemy action will increase".
• Prevent leveling up if there is no available space for further leveling.
• Enemies give less xp in infinite mode.
• Added new enemies for the 3rd zone.

Small update, mostly to fix things (hopefully it doesn't create bigger problems). I have the goal to finish the last zone by end of year.