Thank you! This is great quality feedback - I'll give the points/milestone system a much-needed rework and shine-up.
Regarding victory, I was considering whether to add having at least 1 of each Red animal type alongside the 1500 points (the Warcurana and Tyrantaphant). The total fusion goal/counter is a great suggestion!
The shooting mechanic will take some tough work to reconfigure - an alternative approach could be to grant the player immunity upon making new fusions, and once their collection is complete, to make the finished fusion set passive altogether.
And thank you for mentioning Disco Zoo - this game is a hidden gem! Gave me a 2014 nostalgia rush! I'll be playing through it again, this time with the eye of a programmer instead of a player.