The way it’s currently coded, your chances of being offered your first starter pack increase by 20% every level until 100% on the 6th level. It sounds like that’s not a strong enough guarantee when considering that some players will low-roll. I’ll definitely make sure to tune that for the post-jam update!
I wonder how other roguelikes are playtested though; it seems like it’s hard to test low / high-rolls without playing through a ton of runs.