The Demo of Objector is available on Steam. Try it now.

It presents the first two episodes, every finished with bossfight. There are also more demanding bossfight versions. Objector is a hard side-scroller platform game with challenging choreographed boss fights set in a diverse fantasy world. Find more info and download the demo from the Objector's Steam Store site: https://store.steampowered.com/app/2219530/Objector/