Hello! Thank you for your feedback.
1) Currently you can only interact with computers for upgrades. We rushed to post the game in time and the batteries code was half-baked, for the next instalment, Otto will be able to collect them.
2) Backtracking is part of the game, but youre right were needing a map.
3) We certainly agree and we plan to add a little explanation for each upgrade on future instalments.