I can't fight Tierramon at all. Sometimes the keys don't work at all and sometimes they're really slow to respond. I'm continuing with the Obsidian heart I started with before in the other alpha review and this is what happens. I can now go to the first mission that's outside of the tutorial, I pass the two signs there and then go west and try to go west and fight/capture the Bod Tierramon (the topaz heart one). During the fight, I can't do anything sometimes and the x key for checking health doesn't work at all. The battle controls only sometimes work and sometimes they're kind of slow.
Also, I don't understand what you meant about restarting the game. The Tierramon game stuff is stored on my external hard drive and nothing's installed on my computer, so the location you mentioned makes no sense to me for deleting my save file. Is it supposed to start me off where I was during the last alpha I tried too? I was using Alpha 1 and when I went to alpha 4 it started me off where i was last in the previous alpha I tried.