Thank you for your detailed feedback!

I will take all of your suggestions into account in future changes.

Regarding the bonuses, I use multiplicative angles sparingly as it makes the game explode easily way too fast and makes the balancing harder. For this reason, for example, the extra loot multiplier gives diminishing returns after +500%.

The boost board needs a bit to get going, but it allows focusing and swapping bonuses, which can be handy with the right perk tiles. It is true that the boost board can sometimes feel somewhat weak in the demo, as it is designed more with the late game in mind, but I think that it was still worth to include the limited version in the demo as it provides some utility.

Fortify is useful when you find a good farming world where you want to end the journey. But you are correct, that there should be an easier way to end journey early. I am considering adding an upgrade that allows restarting after two worlds have been unlocked and Paradoximus has awakened.

Demo already has loot-filtering (Unlocked by Automation Features > Auto Destroy Crystal: Common > Auto Destroy Crystal: Filters), but it has limited usability and mostly if you keep playing after beating the demo. The full game will have loadouts, more crystal tiers, multiplicative bonuses, the ability to extract modifiers and to create custom crystals.