Reps have a 1-40 range, so you cannot have more than 40 reps (or counts) in a set. If you work out in time intervals (like, 2 minute rounds of sit-ups) and not simply “3 sets of 15”, Horkeukamui will not be able to help you.
The rest timer is broken. It technically has a 30-120 range, but inputting any number always leads to an automatic 30 (second?) rest time.
App allows for 1-5 sets.
Otherwise, it’s cute and inspired!