I feel like the Equipment system is currently overvalued.
Why do I magically lose my old equipment when I buy new ones? Could you somehow incorporate the cost/value of current equipment when buying new stronger equipment?
(ie current equipment is resold for 40% of purchase value, and that resale goes to reduce cost of new equipment)
2/5....... Needs a speed up button in gameplay and a skip button for the score counting. I advise you make the space bar a action where if you hold it and click on the feild you can place multiple towers/boosters instead of having to continuously clicking 1-click, 1-click.... 1-click
^^
Otherwise its a nice game