Finished around 14000-15000

You can progress without paying in the early stages, but the enemies' strength reflects the player's strength, so even if you raise your stats, you won't be able to win for long. If you don't raise your stats evenly, you'll get stuck depending on the race terrain. The basic way to raise stats is through training bags, but it takes time and it's easy to become unbalanced because it's random which stats you can raise. On top of that, enemies normally use gadgets with high rarity and level, so you'll get stuck. Ticket events with time limits are basically paid content, so it's impossible to clear them to the end without paying. There's a performance gap where you absolutely can't win against opponents using gadgets of higher rarity and level than yours, and the amount you spend is also high, so if you're going to play, you should be prepared. I played a lot because the timed quests were good... but I strongly felt it was a gadget game, so I'm stopping here.