New Beta Build

I've been working on a few things that will require some testing so for a little bit I'll be putting all the new changes into a Steam beta.

You can opt into the beta by right clicking the game in your Steam library, clicking 'Properties,' and going to the 'Betas' tab.

What's in the Beta so far?:

• Added Stockpile Specialty, Towers built with this Specialty gain an additional Item Slot!

• Stockpile Specialty gained from completing Singleplayer level 6, all other specialties require one less level to unlock. For anyone who has already completed level 6 they will unlock this Specialty automatically upon starting the game.

• Presents can now spawn beyond wave 50 for endless mode.

• Fixed Steam Rich Presence reporting the wrong difficulty for the host player in their friends list.

• Stun Immune & Slow Immune waves added to Serious Difficulty.

• Removed 'None' Specialty option.

Some of these changes required a lot of stable code to be touched so I'm being cautious and making sure they're all tested and working before I put it on the main branch. I wanted everyone to be able to try out the new Specialty though which is why I've made the beta public for you all.

I don't think there are any bugs with it but I've been wrong before! Have fun everyone.