No need to say sorry at all! Your comment really helped. Because of it I changed the tutorial: now it only gives tips, every button works from the start, and you can move your soldiers whenever you want. You can also skip the first night with the link at the top of the screen. It's all in the new update. I mentioned your name on the changelog as well. I am waiting for your further testings and support if possible.
About the lag: go to Settings > Graphics and set Quality preset to Low. It should run much smoother, and it doesn't change the gameplay. If it still lags, let me know and I'll look into it.