Oi!
The enemies are now randomly put together based on their family. A family simply contains a pool of parts they can use and their rarity. So we still have the freedom to put, for example, a ranged Megac on a pillar, but they can have a variety of different parts with ranged abilities and will behave according to those.
Rare parts come with their own palette, so you will notice when a Megac has something special. This is the case in the screenshot below. The blue enemy is actually a ranged Megac (normally colored yellow), but has a different palette because it has the uncommon drill legs.
Also, all creatures now only drop a single part and the treasure chests don't contain parts anymore (with a few exemptions). I've only just made this change and it already feels a lot more fun to collect parts. The chests are going to have bits in them, they're a way to restore lost lives and will in later updates most likely be used to unlock things like fight levels and buy special parts.
These changes and a lot more are in the next update which should be here sometime next week. Including two new abilities, one of them explosive. Don't forget that you can show your support by pre-ordering the game (and get tasty extra content too)!
Have a nice weekend!
