No worries! Tipping or giving donations is fine because it goes back to the game anyway. e.g.) art commissions. However, at this point, I would appreciate it more if people wishlist the game on Steam and spread the word to their friends!
More wishlists in Steam = Higher visibility = Better chances of success during launch day :D
For reference: https://store.steampowered.com/app/1377710/Lawmage_Academy/