It’s a simple game, but it’s entertaining.
The three types of scientists are all quite differentiated, with each one having a unique role: the basic unit that is balanced, the attacker that is more fragile, and the defensive that has no attack. That’s cool and adds variety, so it’s a shame that there isn't at least one more type of enemy (or something else) that spices things up a bit and helps give more replay value.
Overall, the game lacks some depth and the end feels somewhat abrupt, because there are still many clowns on screen when you win (it would be nicer if they stopped spawning), but it’s fun to play while you’re still finding the best strategy, so kudos! =)