Thank you for your feedback 😁 yeah it is quite tricky! would have loved to get more of the features in and I can see us/myself adding hints and tutorial snippets to help resolve some of those initial game learning hurdles.
The lag spike is an odd behaviour with unreal engine when you are not focussed on the window to do with physics, we just need to add a few more checks in the code to make it pause the game when you alt tab and that should hopefully fix the lag spikes. Or was it perhaps another circumstance when you experienced that?