Thanks for playing! A better upgrade tree was in the works but unfortunately had to be cut due to the jams deadline. We found that a fully functional but simple set of upgrades was better than an unfinished, broken, and jumbled mess of additional abilities and stat changes. If we move into a full release I’m sure we’ll introduce a wider variety of modifications and improvements for the sub. The fish values were a problem to display on the programming end but I’m not qualified to speak on it myself unfortunately. Thank you for offering up your ideas and comments! It helps us know what to focus on moving forward.