hitboxes are wack as hell cuz i kept dying to thin air because there was a spike near it, so either the hitboxes are lagging behind the sprites due to scratch jank or you made the hitboxes too big. if the latter is the case then something that i recommend is making the hitboxes not be the same size as the sprites because that generally leads to jank happening, and if you look at something like geometry dash the spike hitboxes are very small compared to the sprites which makes the overall game feel better. one thing that you can do to make the game more replayable is by adding something that shows your personal best surviving time, as it will make people want to come back to the game to beat their personal best. one thing i do like is the cubes having special effects like giving more money or being smaller (small duck mains rise up) as it gives intensive to get those other cubes, though i feel like ones like small duck should be the most expensive as being smaller is easily the best effect and makes the game a whole lot easier (i was able to reach 2058 using it). also the tags say that its a spiderlike but the transition isnt instant so its more of a balllike (though i think you should keep it that way cuz i HATE the spider and ball is the BEST gamemode).
hope this review could be some use to you

There's the beginnings of a pretty decent game here. All you have to add is a "restart" button when you die so the user can keep playing without reloading the page!