This game is a lot of fun and very addictive, but I couldn't use my power-ups/inventory. I felt like a real criminal! I can see this becoming a big game if you add features like working cars. Keep up the good work!
Items seem to work fine on our end, we'll try to fix it if possible. Try pressing Q, right clicking, or pressing a number key first to select the item but slot 1 is auto selected. Glad you're liking the game!