Those are some really great changes, especially the change to breakable blocks. I may not know which bear will break it but at least now I'll know which ones to avoid if I see a bear hurdling towards it. I also like how easy mode does more than just give you more hp, really good for those just in it for the lewd.
So far I've only seen 3 power ups and here's my take:
Speed boost: Since the screen is always moving at its own pace and you never want to be too far to the right this power-up has very little utility.
Magnet: No complaints, it works well, it feels like less bears drop when it's active but it may just be luck.
Heart: No problems.
Is that all of them or have I been unlucky? I'm not much of an idea guy but as I played I felt these powerups would be helpful:
Slow time: Personally, I'd just replace the speed boost with this one, would be pretty handy but might make the game too easy if it drops too often.
Jump boost: This would really come in handy on those levels with the vertical saws.
Block regenerator: Again this might go against your intended difficulty, it wouldn't have to bring them all back but some levels can get out of hand if you miss one too many bears.
Lastly, the lewd content. I understand this game just came out and it's still early so it's going to be light on the H but it needs better pacing. What I mean is that you have quite a few difficult levels to go through just to get to the goods and a lot of people are going to be put off when they get to the 2nd set of stages and see that XXX level buried underneath all those other levels you have to go through.
I'm not saying you have to have an animation every other level (though I wouldn't complain haha) but you may want to take some of the tamer pictures out of the store and place them as rewards for certain levels or do away with the store entirely as it's very easy to accrue more than enough bears in a short time frame to buyout the gallery.
Me? I like the difficulty and rewards as they are but I'm the odd one out when it comes to h-games, the harder the better I say. If it were up to me (and if I were making the game just for me) I'd keep the system as it is and just expand more on the animation reward at the end, they're a bit too brief for my liking. I'm not a patron though so you do what you gotta do.