I really love the game's name! The animal art is great and I hope you'll add some animation when you have time.
I didn't understand the "money system" because you buy an animal but it doesn't deduct and you can buy as much of an animal as you want once you hit that animal's price. Then I realised it's not price, it's points, so I would recommend making this system clearer in a future version of the game. Maybe don't call it a "shop", indicate that the number is a level or a threshold, and, in keeping with the theme, call the points something like "mutation capacity" or "research threshold" or similar.
It seems that you can win just by waiting for the points to hit 1500 so I would suggest the win state rather being creating a certain number of fuses, or a certain number of difficult fuses, or something. It would also be cool if the win screen only shows you creations you have made so the surprise of the others remains. (Same with the itch game page - don't give too much away in the screenshots once the jam is over.)
I'm in two minds about the aggression/shooting mechanic because it does add some action and it's smooth but at the same time the larger theme lends itself to collecting and experimentation, so then the aggression gets in the way because you just want to mix and match and wander around having a look at your creations (likely even more so if they are animated later).
This is the starting point of something that could be really interesting and I think the trick is figuring out what the best bits are and building on that but being careful with the balance so you keep it interesting. The shooting is the only action mechanic so if you took that out you'd need something to replace it. (I'd also recommend looking at two mobile games that feature collecting as the primary goal - Disco Zoo and Tap! Dig! My Museum! - and then figuring out what works and what doesn't and how you might be able to apply some of those principles (not the mechanics). (I find Tap! Dig! My Museum!'s digging mechanic to be a bit tedious, whereas I think Disco Zoo is a near perfect game, but I enjoy playing both and haul them out every once in a while. Also note that Disco Zoo was partly built as a game for parents to play with their young kids so that's why the collection mechanic is very basic.)