I played the first two levels but I couldn't beat level 3. I didn't have enough money to buy more than one tower. I didn't undersand how to get more money... but I do like the concept and the fact that you're a beaver. If you want to improve it in the future for a full release, I'd recommand thinking about what the core challenge is, because swimming away is quite easy until level 3 where eventually you will be trapped between the boss and the torpedoes. But all around, I think the concept is solid and can definitely be turned into a really fun experience!