Game should get harder over time

[kdungs]

• Faster weasels
• Faster spawn rate
• More expensive transformers

[pseyfert]

• weasel spawn probability should depend on number of installed transformers (big fat wall will not stand for long)
• adjust hit points (with random value?) such that weasel can (now and then) survive a collision with an already hit transformer
• random chain reaction (exploding transformer kills close-by transformer, too). creates an incentive not to fill the entire area with transformers. probability could scale with money.

[kdungs]

Detector (maybe also transformers) could slowly recover health for balance

[kdungs]

Transformers could have a limited number of targetable enemies i.e. always attack the closest

[kdungs]

Weasels spawn faster and with higher speed over time.