This is really well made! Generous enough to feel possible, but if you aren't careful you could easily lose!=. Good job on balancing that! With a bit of polish, this could be a great standalone game!
Some feedback below:
Great that I could see my score at the end, but I couldn't tell how good I was doing? For example, one time I beat a level with 1 person left and got 1000 points, on another level I had 8 people left and had 2400 points. I didn't know if these were good or bad numbers for the level I was on. I would recommend putting a 'grade' next to the score (eg. "S", "A", "B", etc) so that players know that they could try and be better at the game
Didn't seem like I was being rewarded for completing the level using fewer troops? If I was, I wasn't seeing it. it would be great if any left over money I didn't use carried over to the next level (as one possible solution), or it could just be bonus points at the end of the level!
I'm not sure, but it seemed like I was rewarded for spending as much money as possible and thereby letting more people survive thereby giving me more points, but the 'placement' phase of the game made it seem like i would be rewarded for strategy and that implies doing more with less.